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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination antibiotic consisting of piperacillin, a broad-spectrum penicillin antibiotic, and tazobactam, a beta-lactamase inhibitor. It is active against many Gram-positive, Gram-negative, and anaerobic bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Bacterial infections in febrile neutropenic patients
## Adult Dosing
The typical dose is 3.375 grams every 6 hours or 4.5 grams every 8 hours administered intravenously. Duration of therapy is guided by clinical response, typically 7 to 14 days. For febrile neutropenia, a typical course is 7 days or until neutrophil recovery.
## Pediatric Dosing
Dosing is weight-based and depends on age and indication.
* **Intra-abdominal infections (3 months to 12 years):** 100 mg piperacillin/12.5 mg tazobactam per kg body weight every 8 hours. Maximum dose: 3.375 grams every 8 hours.
* **Complicated skin and skin structure infections (3 months to 12 years):** 75 mg piperacillin/9.375 mg tazobactam per kg body weight every 8 hours. Maximum dose: 3.375 grams every 8 hours.
* **Febrile neutropenia (3 months to 12 years):** 100 mg piperacillin/12.5 mg tazobactam per kg body weight every 8 hours. Maximum dose: 3.375 grams every 8 hours.
Dosing for neonates and infants younger than 3 months is not well established and requires careful consideration of renal and hepatic function, often guided by specialist consultation.
## Dose Adjustments
* **Renal Impairment:** Dosing adjustments are necessary for patients with a creatinine clearance (CrCl) < 40 mL/min.
* CrCl 20-40 mL/min: 2.25 grams every 6 hours or 3.375 grams every 8 hours.
* CrCl < 20 mL/min: 2.25 grams every 8 hours or 3.375 grams every 12 hours.
* Hemodialysis: 2.25 grams every 8 hours, administered at the end of dialysis. An additional dose of 0.75 grams is recommended after each dialysis session.
* **Hepatic Impairment:** No specific dose adjustment is usually recommended, but caution is advised.
## Contraindications
* Known serious hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors.
## Adverse Effects
Common: Diarrhea, rash, nausea, vomiting, headache, insomnia, fever, injection site reactions.
Serious: Clostridioides difficile-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (particularly with high doses or renal impairment), neutropenia, thrombocytopenia, eosinophilia.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of rocuronium and vecuronium.
* **Warfarin:** Monitor INR closely as piperacillin may decrease warfarin's anticoagulant effect.
* **Methotrexate:** Penicillins may decrease the renal clearance of methotrexate, leading to increased toxicity.
* **Live bacterial vaccines:** May be less effective.
## Monitoring
* Renal function (CrCl) for dose adjustment.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of C. difficile infection.
* Complete blood count (CBC) with differential and platelet count, especially with prolonged therapy.
* Liver function tests may be considered.
## Clinical Pearls
* Piperacillin/tazobactam has a broad spectrum but is not reliably active against MRSA or ESBL-producing organisms. Susceptibility testing is crucial.
* Reconstituted solutions should be used within 24 hours when refrigerated or within 12 hours at room temperature.
* Ensure adequate hydration to minimize the risk of crystalluria.
* Tazobactam protects piperacillin from degradation by many beta-lactamases, extending its spectrum of activity.
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*This information is intended for healthcare professionals. Always consult the official prescribing information and institutional guidelines for the most current and complete details regarding drug use, including specific dosing, contraindications, warnings, precautions, and potential adverse effects. Clinical decisions should be based on individual patient factors and professional judgment.*
